<input type="number" value="" @input="checkInput">
checkInput(){
    // 数字转为整数
    this.jinef=Math.trunc(this.jinef)
    // 绝对值
    this.jinef=Math.abs(this.jinef)
    // 大于14位字符串时保留14位字符串
    const length=this.jinef.length
    if(length>14){
        this.jinef=this.jinef.slice(0,14);
    }
}